<?php

/**
 * Sort handler for ordering by thread
 */
class views_handler_sort_comment_thread extends views_handler_sort {

    function query() {
        $this->ensure_my_table();

        //Read comment_render() in comment.module for an explanation of the
        //thinking behind this sort.
        if ($this->options['order'] == 'DESC') {
            $this->query->add_orderby($this->table_alias, $this->real_field, $this->options['order']);
        } else {
            $alias = $this->table_alias . '_' . $this->real_field . 'asc';
            //@todo is this secure?
            $this->query->add_orderby(NULL, "SUBSTRING({$this->table_alias}.{$this->real_field}, 1, (LENGTH({$this->table_alias}.{$this->real_field}) - 1))", $this->options['order'], $alias);
        }
    }

}
